Little Women(1949) [Beth March]: Dies (off-screen) of heart failure (due to a previous bout of scarlet fever), with her family gathered by her bedside. (Thanks to Jeff)

Little Women(1958) [Beth March]: Dies of heart failure (due to a previous bout of scarlet fever), with her family gathered by her bedside. (I haven't seen this version, but she is playing the same role as in the 1949 version.)